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  <title>WebGL points layer</title>
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      <div class="span12">
        <h4 id="title">WebGL 点图层</h4>
        <p class="tags">
          <span class="badge-group">
            <a href="./index.html?q=webgl" class="badge badge-info">webgl</a><a
              class="badge badge-info tag-modal-toggle" data-bs-toggle="modal" data-bs-target="#tag-example-list"
              data-title="webgl" data-content="&lt;ul class=&quot;list-group&quot;&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-stretch.html&quot;&gt;Band Contrast Stretch&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-style.html&quot;&gt;Change Tile Layer Style&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-draw-line.html&quot;&gt;Draw lines rendered with WebGL&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./heatmap-earthquakes.html&quot;&gt;Earthquakes Heatmap&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./geotiff-reprojection.html&quot;&gt;GeoTIFF Reprojection&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-layer-swipe.html&quot;&gt;Layer Swipe (WebGL)&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./multiple-cogs.html&quot;&gt;Multiple COG sources&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./numpytile.html&quot;&gt;Rendering 16-bit NumpyTiles&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-sea-level.html&quot;&gt;Sea Level (with WebGL)&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-shaded-relief.html&quot;&gt;Shaded Relief (with WebGL)&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-tile-style.html&quot;&gt;WebGL Tile Layer Styles&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-tiles.html&quot;&gt;WebGL Tiles&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-vector-layer.html&quot;&gt;WebGL Vector Layer&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-vector-tiles.html&quot;&gt;WebGL Vector Tiles Layer&lt;/a&gt;
                  &lt;/ul&gt;" tabindex="0">17</a>
          </span>
          <span class="badge-group">
            <a href="./index.html?q=point" class="badge badge-info">point</a><a
              class="badge badge-info tag-modal-toggle" data-bs-toggle="modal" data-bs-target="#tag-example-list"
              data-title="point" data-content="&lt;ul class=&quot;list-group&quot;&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;
                  &lt;/ul&gt;" tabindex="0">2</a>
          </span>
          <span class="badge-group">
            <a href="./index.html?q=layer" class="badge badge-info">layer</a><a
              class="badge badge-info tag-modal-toggle" data-bs-toggle="modal" data-bs-target="#tag-example-list"
              data-title="layer" data-content="&lt;ul class=&quot;list-group&quot;&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./layer-z-index.html&quot;&gt;Layer Z-Index&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./layer-zoom-limits.html&quot;&gt;Layer Zoom Limits&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./svg-layer.html&quot;&gt;SVG Layer&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;
                  &lt;/ul&gt;" tabindex="0">4</a>
          </span>
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            <a href="./index.html?q=feature" class="badge badge-info">feature</a><a
              class="badge badge-info tag-modal-toggle" data-bs-toggle="modal" data-bs-target="#tag-example-list"
              data-title="feature" data-content="&lt;ul class=&quot;list-group&quot;&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri.html&quot;&gt;ArcGIS REST Feature Service&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./box-selection.html&quot;&gt;Box Selection&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./feature-animation.html&quot;&gt;Custom Animation&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-circle-render.html&quot;&gt;Custom Circle Render&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-hit-detection-renderer.html&quot;&gt;Custom Hit Detection Render&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-interactions.html&quot;&gt;Custom Interactions&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri-edit.html&quot;&gt;Editable ArcGIS REST Feature Service&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./flight-animation.html&quot;&gt;Flight Animation&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./feature-move-animation.html&quot;&gt;Marker Animation&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./translate-features.html&quot;&gt;Translate Features&lt;/a&gt;
                  &lt;li&gt;&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;
                  &lt;/ul&gt;" tabindex="0">12</a>
          </span>
        </p>
        <div class="modal modal-tag-example" id="tag-example-list" tabindex="-1" role="dialog"
          aria-labelledby="tag-example-title" aria-hidden="true">
          <div class="modal-dialog modal-dialog-scrollable" role="document">
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                <div class="list-group"></div>
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            </div>
          </div>
        </div>
        <div id="map" class="map"></div>
        在下边列表中选择一个提前定义的样式，或者作为 JSON 手动编辑。
        <select id="style-select">
          <option value="icons">Icons</option>
          <option value="triangles">Triangles, color related to population</option>
          <option value="triangles-latitude">Triangles, color related to latitude</option>
          <option value="circles">Circles, size related to population</option>
          <option value="circles-zoom">Circles, size related to zoom</option>
          <option value="rotating-bars">Rotating bars</option>
        </select>
        <textarea style="width: 100%; height: 20rem; font-family: monospace; font-size: small;"
          id="style-editor"></textarea>
        <small>
          <span id="style-valid" style="display: none; color: forestgreen">✓ style is valid</span>
          <span id="style-invalid" style="display: none; color: grey">✗ <span>style not yet valid...</span></span>
          &nbsp;
        </small>

      </div>
      <form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
        <input id="codesandbox-params" type="hidden" name="parameters">
      </form>
    </div>

    <div class="row-fluid">
      <div class="span12">
        <p id="shortdesc">Using a WebGL-optimized layer to render a large quantities of points</p>
        <div id="docs">
          <p>
            这个例子展示了如何使用`WebGLPointsLayer`来显示地图上的大量点。该层被赋予JSON格式的样式，允许对最终表示进行一定程度的自定义。
          </p>
          <p>
            请参阅<a href="/en/latest/apidoc/module-ol_expr_expression.html#~ExpressionValue">有关表达式的文档</a>了解要使用哪些运算符以及如何使用。
          </p>
        </div>
      </div>
    </div>

    <div class="row-fluid">
      <h5 class="source-heading">main.js</h5>
      <pre><code id="example-js-source" class="language-js">import GeoJSON from &#x27;ol/format/GeoJSON.js&#x27;;
import Map from &#x27;ol/Map.js&#x27;;
import OSM from &#x27;ol/source/OSM.js&#x27;;
import TileLayer from &#x27;ol/layer/Tile.js&#x27;;
import Vector from &#x27;ol/source/Vector.js&#x27;;
import View from &#x27;ol/View.js&#x27;;
import WebGLPointsLayer from &#x27;ol/layer/WebGLPoints.js&#x27;;

const vectorSource &#x3D; new Vector({
  url: &#x27;data/geojson/world-cities.geojson&#x27;,
  format: new GeoJSON(),
  wrapX: true,
});

const predefinedStyles &#x3D; {
  icons: {
    &#x27;icon-src&#x27;: &#x27;data/icon.png&#x27;,
    &#x27;icon-width&#x27;: 18,
    &#x27;icon-height&#x27;: 28,
    &#x27;icon-color&#x27;: &#x27;lightyellow&#x27;,
    &#x27;icon-rotate-with-view&#x27;: false,
    &#x27;icon-displacement&#x27;: [0, 9],
  },
  triangles: {
    &#x27;shape-points&#x27;: 3,
    &#x27;shape-radius&#x27;: 9,
    &#x27;shape-fill-color&#x27;: [
      &#x27;interpolate&#x27;,
      [&#x27;linear&#x27;],
      [&#x27;get&#x27;, &#x27;population&#x27;],
      20000,
      &#x27;#5aca5b&#x27;,
      300000,
      &#x27;#ff6a19&#x27;,
    ],
    &#x27;shape-rotate-with-view&#x27;: true,
  },
  &#x27;triangles-latitude&#x27;: {
    &#x27;shape-points&#x27;: 3,
    &#x27;shape-radius&#x27;: [
      &#x27;interpolate&#x27;,
      [&#x27;linear&#x27;],
      [&#x27;get&#x27;, &#x27;population&#x27;],
      40000,
      6,
      2000000,
      12,
    ],
    &#x27;shape-fill-color&#x27;: [
      &#x27;interpolate&#x27;,
      [&#x27;linear&#x27;],
      [&#x27;get&#x27;, &#x27;latitude&#x27;],
      -60,
      &#x27;#ff14c3&#x27;,
      -20,
      &#x27;#ff621d&#x27;,
      20,
      &#x27;#ffed02&#x27;,
      60,
      &#x27;#00ff67&#x27;,
    ],
    &#x27;shape-opacity&#x27;: 0.95,
  },
  circles: {
    &#x27;circle-radius&#x27;: [
      &#x27;interpolate&#x27;,
      [&#x27;linear&#x27;],
      [&#x27;get&#x27;, &#x27;population&#x27;],
      40000,
      4,
      2000000,
      14,
    ],
    &#x27;circle-fill-color&#x27;: [&#x27;match&#x27;, [&#x27;get&#x27;, &#x27;hover&#x27;], 1, &#x27;#ff3f3f&#x27;, &#x27;#006688&#x27;],
    &#x27;circle-rotate-with-view&#x27;: false,
    &#x27;circle-displacement&#x27;: [0, 0],
    &#x27;circle-opacity&#x27;: [
      &#x27;interpolate&#x27;,
      [&#x27;linear&#x27;],
      [&#x27;get&#x27;, &#x27;population&#x27;],
      40000,
      0.6,
      2000000,
      0.92,
    ],
  },
  &#x27;circles-zoom&#x27;: {
    // by using an exponential interpolation with a base of 2 we can make it so that circles will have a fixed size
    // in world coordinates between zoom level 5 and 15
    &#x27;circle-radius&#x27;: [
      &#x27;interpolate&#x27;,
      [&#x27;exponential&#x27;, 2],
      [&#x27;zoom&#x27;],
      5,
      1.5,
      15,
      1.5 * Math.pow(2, 10),
    ],
    &#x27;circle-fill-color&#x27;: [&#x27;match&#x27;, [&#x27;get&#x27;, &#x27;hover&#x27;], 1, &#x27;#ff3f3f&#x27;, &#x27;#006688&#x27;],
    &#x27;circle-displacement&#x27;: [0, 0],
    &#x27;circle-opacity&#x27;: 0.95,
  },
  &#x27;rotating-bars&#x27;: {
    &#x27;shape-rotation&#x27;: [&#x27;*&#x27;, [&#x27;time&#x27;], 0.13],
    &#x27;shape-points&#x27;: 4,
    &#x27;shape-radius1&#x27;: 4,
    &#x27;shape-radius2&#x27;: 4 * Math.sqrt(2),
    &#x27;shape-scale&#x27;: [
      &#x27;array&#x27;,
      1,
      [&#x27;interpolate&#x27;, [&#x27;linear&#x27;], [&#x27;get&#x27;, &#x27;population&#x27;], 20000, 1, 300000, 7],
    ],
    &#x27;shape-fill-color&#x27;: [
      &#x27;interpolate&#x27;,
      [&#x27;linear&#x27;],
      [&#x27;get&#x27;, &#x27;population&#x27;],
      20000,
      &#x27;#ffdc00&#x27;,
      300000,
      &#x27;#ff5b19&#x27;,
    ],
    &#x27;shape-displacement&#x27;: [
      &#x27;array&#x27;,
      0,
      [&#x27;interpolate&#x27;, [&#x27;linear&#x27;], [&#x27;get&#x27;, &#x27;population&#x27;], 20000, 2, 300000, 14],
    ],
  },
};

const map &#x3D; new Map({
  layers: [
    new TileLayer({
      source: new OSM(),
    }),
  ],
  target: document.getElementById(&#x27;map&#x27;),
  view: new View({
    center: [0, 0],
    zoom: 2,
  }),
});

let literalStyle;
let pointsLayer;

let selected &#x3D; null;

map.on(&#x27;pointermove&#x27;, function (ev) {
  if (selected !&#x3D;&#x3D; null) {
    selected.set(&#x27;hover&#x27;, 0);
    selected &#x3D; null;
  }

  map.forEachFeatureAtPixel(ev.pixel, function (feature) {
    feature.set(&#x27;hover&#x27;, 1);
    selected &#x3D; feature;
    return true;
  });
});

function refreshLayer(newStyle) {
  const previousLayer &#x3D; pointsLayer;
  pointsLayer &#x3D; new WebGLPointsLayer({
    source: vectorSource,
    style: newStyle,
  });
  map.addLayer(pointsLayer);

  if (previousLayer) {
    map.removeLayer(previousLayer);
    previousLayer.dispose();
  }
  literalStyle &#x3D; newStyle;
}

const spanValid &#x3D; document.getElementById(&#x27;style-valid&#x27;);
const spanInvalid &#x3D; document.getElementById(&#x27;style-invalid&#x27;);
function setStyleStatus(errorMsg) {
  const isError &#x3D; typeof errorMsg &#x3D;&#x3D;&#x3D; &#x27;string&#x27;;
  spanValid.style.display &#x3D; errorMsg &#x3D;&#x3D;&#x3D; null ? &#x27;initial&#x27; : &#x27;none&#x27;;
  spanInvalid.firstElementChild.innerText &#x3D; isError ? errorMsg : &#x27;&#x27;;
  spanInvalid.style.display &#x3D; isError ? &#x27;initial&#x27; : &#x27;none&#x27;;
}

const editor &#x3D; document.getElementById(&#x27;style-editor&#x27;);
editor.addEventListener(&#x27;input&#x27;, function () {
  const textStyle &#x3D; editor.value;
  try {
    const newLiteralStyle &#x3D; JSON.parse(textStyle);
    if (JSON.stringify(newLiteralStyle) !&#x3D;&#x3D; JSON.stringify(literalStyle)) {
      refreshLayer(newLiteralStyle);
    }
    setStyleStatus(null);
  } catch (e) {
    setStyleStatus(e.message);
  }
});

const select &#x3D; document.getElementById(&#x27;style-select&#x27;);
select.value &#x3D; &#x27;circles&#x27;;
function onSelectChange() {
  const style &#x3D; select.value;
  const newLiteralStyle &#x3D; predefinedStyles[style];
  editor.value &#x3D; JSON.stringify(newLiteralStyle, null, 2);
  try {
    refreshLayer(newLiteralStyle);
    setStyleStatus();
  } catch (e) {
    setStyleStatus(e.message);
  }
}
onSelectChange();
select.addEventListener(&#x27;change&#x27;, onSelectChange);

// animate the map
function animate() {
  map.render();
  window.requestAnimationFrame(animate);
}
animate();
</code></pre>
    </div>

    <div class="row-fluid">
      <h5 class="source-heading">index.html</h5>
      <pre><code id="example-html-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
  &lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;WebGL points layer&lt;/title&gt;
    &lt;link rel="stylesheet" href="node_modules/ol/ol.css"&gt;
    &lt;style&gt;
      .map {
        width: 100%;
        height: 400px;
      }
    &lt;/style&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    Choose a predefined style from the list below or edit it as JSON manually.
    &lt;select id&#x3D;&quot;style-select&quot;&gt;
      &lt;option value&#x3D;&quot;icons&quot;&gt;Icons&lt;/option&gt;
      &lt;option value&#x3D;&quot;triangles&quot;&gt;Triangles, color related to population&lt;/option&gt;
      &lt;option value&#x3D;&quot;triangles-latitude&quot;&gt;Triangles, color related to latitude&lt;/option&gt;
      &lt;option value&#x3D;&quot;circles&quot;&gt;Circles, size related to population&lt;/option&gt;
      &lt;option value&#x3D;&quot;circles-zoom&quot;&gt;Circles, size related to zoom&lt;/option&gt;
      &lt;option value&#x3D;&quot;rotating-bars&quot;&gt;Rotating bars&lt;/option&gt;
    &lt;/select&gt;
    &lt;textarea style&#x3D;&quot;width: 100%; height: 20rem; font-family: monospace; font-size: small;&quot; id&#x3D;&quot;style-editor&quot;&gt;&lt;/textarea&gt;
    &lt;small&gt;
      &lt;span id&#x3D;&quot;style-valid&quot; style&#x3D;&quot;display: none; color: forestgreen&quot;&gt;✓ style is valid&lt;/span&gt;
      &lt;span id&#x3D;&quot;style-invalid&quot; style&#x3D;&quot;display: none; color: grey&quot;&gt;✗ &lt;span&gt;style not yet valid...&lt;/span&gt;&lt;/span&gt;
      &amp;nbsp;
    &lt;/small&gt;

    &lt;script type="module" src="main.js"&gt;&lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
    </div>

    <div class="row-fluid">
      <h5 class="source-heading">package.json</h5>
      <pre><code id="example-pkg-source" class="language-json">{
  &quot;name&quot;: &quot;webgl-points-layer&quot;,
  &quot;dependencies&quot;: {
    &quot;ol&quot;: &quot;8.2.0&quot;
  },
  &quot;devDependencies&quot;: {
    &quot;vite&quot;: &quot;^3.2.3&quot;
  },
  &quot;scripts&quot;: {
    &quot;start&quot;: &quot;vite&quot;,
    &quot;build&quot;: &quot;vite build&quot;
  }
}</code></pre>
    </div>
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      return response.json();
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      document.getElementById('latest-version').innerHTML = latestVersion;
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      const storageKey = 'ol-dismissed=-' + latestVersion;
      const dismissed = localStorage.getItem(storageKey) === 'true';
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